Hadith No: 1
Al-Khatib al-Baghdadi - Tarikh Baghdad (History of Baghdad)
Mentioning the story of al-Mada'in in brief and naming the righteous companions who visited it - Al-Hasan and Al-Husayn
Volume: (1) - Page Number: (468)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Muhammad ibn Ahmad ibn Rizq narrated to us, saying: Abd al-Samad ibn Ali ibn Muhammad narrated to us, saying: Al-Husayn ibn Sa'id ibn Azhar al-Sulami narrated to us, saying: Qasim ibn Yahya ibn al-Hasan ibn Zayd ibn Ali narrated to me, saying: Abu Hafs al-A'sha narrated to us from Aban ibn Taghlib, from Abu Ja'far, from Ali ibn al-Husayn, from Al-Husayn ibn Ali from Ali, who said: The Messenger of Allah (peace be upon him and his holy progeny) said, "Al-Hasan and Al-Husayn are the masters of the youth of the inhabitants of Paradise, and their father is better than them."

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Reference: Taareekh Baghdad Book 1

Hadith No: 2
Al-Khatib al-Baghdadi - Tarikh Baghdad (History of Baghdad) - Volume on the letter Alif
Mention of those named Isaac - 3350: Ishaq ibn Abdullah ibn Abi Badr al-Qatrubli
Book: (7) - Page Number: (399)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Abu Muhammad Abdullah ibn Ali ibn Iyad al-Qadi in Sur said: Abu Mohammed Abdullah ibn Ali ibn Iyad al-Qadi in Sur narrated to us, saying: Muhammad ibn Ahmad ibn Jamia al-Ghassani narrated to us, saying: Muhammad ibn al-Husain ibn Ubayd ibn Hamdun, the hafiz known as ibn Ajjal, narrated to us, saying: Ishaq ibn Abdullah ibn Abi Badr al-Qatrubli narrated to us, saying: Hussain ibn Muhammad al-Maruzi narrated to us, saying: Israel narrated to us, from Maysara ibn Habib, from al-Munhal ibn Amr, from Zar ibn Hubaysh, from Hudhayfa from the Prophet (peace be upon him and his holy progeny) who said, "Al-Hasan and Al-Husayn are the leaders of the youth of the people of Paradise."

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Reference: Taareekh Baghdad Book 7

Hadith No: 3
Al-Khateeb al-Baghdadi - Tarikh Baghdad (History of Baghdad) - Chapter on the letter 'Ayn
Mention of those named Abdullah - 5313: Abdullah ibn Amir Abu al-Aswad
Volume: (11) - Page Number: (498)
[The text is lengthy, so only the relevant excerpt is provided here]
- .... Al-Hasan ibn Abi Bakr narrated to us, saying: Ahmad ibn Kamil al-Qadi narrated to us, saying: Ahmad ibn Ali al-Kharraz narrated to us, saying: al-Haytham ibn Kharijah Abu Ahmad narrated to us, saying: Abdul Rahman ibn Amir Abu al-Aswad, Mawla of Banu Hashim, narrated to us, from Asim ibn Abi al-Najud, from Zur ibn Hubaysh, from Hudhayfah, who said: "We saw signs of joy in the face of the Messenger of Allah (peace be upon him and his holy progeny), so we said, 'O Messenger of Allah, we have seen today signs of joy in your face.' He replied, 'And why should I not be joyful, when Gabriel has come to me and given me the glad tidings that Hasan and Husayn are the leaders of the youth of the inhabitants of Paradise, and their father is better than them?'"....

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Reference: Taareekh Baghdad Book 11